Porto 2-1 Chelsea UEFA Champions League RESULT: Plus Barcelona, Bayern Munich and the rest of the group stage action

It's not just Chelsea taking a defeat as Arsenal also suffered a shock loss at home to Olympiacos.

That means it's up to Manchester United and City to turn around the Premier League club's fortunes tomorrow.

I'll leave you with the results of tonight. That's all from me here, thanks for following. Cheerio.

Click here for more fixtures, tables and results with our Match Zone service

90+1min: We are into three added minutes at Porto, and having now seen a replay of the penalty shout - it looks even more clear cut than in real time. Shocking decision by the officials and it could cost Chelsea big time.

90min: That should be a penalty for Chelsea! Costa played the ball across Marcano inside the box and the defender moved his arm towards the ball to divert it away.

Nothing given by the referee and Costa is unsurprisingly furious.

89min: Chelsea have the ball but look no closer to grabbing an equaliser as twinkle toes Imbula turns into an enforcer as he chops down Willian to pick up a booking.

87min: Porto make their final change and it's another familiar face as former Southampton flop Dani Osvaldo comes on to replace Brahimi.

The goals are flying in across Europe! Sergi Roberto and Luis Suarez have scored in the space of two minutes to give Barcelona a 2-1 lead over Bayer Leverkusen with eight minutes to play.

Roma have also pulled another goal back at BATE through Vasilis Torosidis - it's now 3-2 to the hosts.

82min: Now Porto hit the post! From a corner Danilo glances a header towards the back post but it bounces off the woodwork before Begovic punches away the rebound.

Danilo is then booked moments later for the hosts.

80min: Oh that's just taking the Michael! Giannelli Imbula dances through the Chelsea midfield before Nemanja Mtaic brings an end to the shenanigans by bringing him down to pick up a booking.

Porto bring off Andre Andre and sen on Miguel Layun - who is on loan from Watford.

77min: Chelsea have at least improved since the double change as they chase an equaliser.

Aside from Costa hitting the bar and Ivanovic heading wide from a corner, it hasn't really looked like coming. Still at least it isn't wave-after-wave of Porto attacks anymore.

Porto send on Evandro for Ruben Neves.

74min: Mourinho has seen enough as Nemanja Matic and Kenedy come on for Pedro and Ramires.

The Blues nearly grab an equaliser out of nowhere though as Branislav Ivanovic heads wide from a corner.

72min: Goodness me, Chelsea are getting hammered! Begovic is keeping the Blues in this as he saves from Vincent Aboubakar, while Brahimi is also denied.

It's open season in the Chelsea back four!

Good news for Arsenal fans as Alexis Sanchez heads home an equaliser for Arsenal. The bad news is Alfred Finnbogason has gone down the other end and fired Olympiacos back in front. Incredible! You can follow all the action on that game here.

Gervinho has pulled a goal back for Roma who trail 3-1 at BATE, while Zenit have retaken the lead against Gent through Oleg Shatov.

68min: Frustrations are getting to Chelsea as Cesar Azpilicueta is booked for pulling the shirt of Andre Andre.

65min: Chance for Chelsea as Hazard immediately gets involved. The midfielder skips a challenge by leaping over a sliding Maicon tackle, but from a tight angle he fires past Casillas at his near post into the side netting.

Maicon's tackle was actually very late, and Hazard would surely have had a penalty had he gone down. Credit must be given to him for staying on his feet though.

'Hernandez hooked after that miss. While at the other end Sandro misses his third chance of the game. Iniesta asks to be taken off with what looks like a muscle injury. This is real injury crisis now for Barca.'

62min: Jose Mourinho has made his first change, no surprise to see it's an attacking one as Eden Hazard come son to replace Jon Obi Mikel.

Robert Lewandowski has now scored a hat-trick for Bayern Munich as they lead Dinamo Zagreb 5-0.

Junior MOraes has doubled Dynamo Kiev's lead at Maccabi tel-Aviv while Gent have equalised at Zenit through Thomas MAtton.

'Monumental miss from Chicharito at the start of the second half blazing over with the goal at his mercy.'

54min: Off the woodwork! Chelsea nearly hit straight back as Costa curls a beautiful shot across goal, but with Casillas stretching out at thin air, the ball bounces back off the underside of the bar and clear.

52min: Jose Mourinho looks on almost motionless from the touchline - maybe he is mirroring his defence.

From a Porto corner, all the Blues defenders are ball watching as Maicon nips ahead at the near post to glance a cheeky header home.

49min: Back up the other end and Porto also show attacking intent as Ruben Nevas curls wide of the top corner from distance.

I'm shocked to realise he is just 18-years-old, he has looked so comfortable in the Porto midfield this evening.

48min: Positive opening from Chelsea. Willian links up with Diego Costa inside the box, whose shot is blocked behind for a corner.

No changes at the break as play restarts in Porto.

Remember you can follow all the action of Arsenal vs Olympiacos by clicking here.

Click here for more fixtures, tables and results with our Match Zone service

'Still not convinced Papadopoulous got anything on Calhanoglu's corner but all that matters is Ter Stegen didn't save it and Barcelona are 1-0 down at half time.

'Neymar diving, Sandro missing changes, and Busquets absent. Big job for Luis Enrique at half time. Messi a glum-looking spectator at a flat Camp Nou.'

'Hugely significant goal from Willian. Hadn’t had the best half, but that should allow Chelsea to regroup and recover.'

Chelsea, having done next to nothing in front of goal, win a free-kick in first half stoppage time.

And Willian blasts a 25-yard strike across goal past a rooted Casillas in what was the final kick of the half - that will change the atmosphere in both dressing rooms.

David Ospina has dropped an absolute clanger in the Arsenal goal as Olympiacos retake a shock lead (click here for more) while Sofiane Feghouli has given Valencia the lead three minutes before the break at Lyon.

'Sandro (in for Messi tonight) misses his second clear cut chance. The ball comes back off the post from Neymar's shot and he blazes the rebound over.'

Well, well, well. What is this Chelsea team made of now? Brahimi cuts inside before forcing a brilliant save from Begovic, but on the rebound Andre Andre smashes home despite the Chelsea keeper's best attempts to get a hand on it.

'Martin Atkinson books Neymar for diving in the penalty area. And Ter Stegen has just saved from Bellarabi. It's rotten here so far for Barcelona.'

'Not a terribly good game this. But Chelsea have at least looked better in the last 15 minutes. Diego Costa and Cesc Fabregas looks like the combination which might get them something.'

Mad moments at the Emirates Stadium as Theo Walcott equalises following an Olympiacos opener. Click here for all the details on that.

Meanwhile BATE now lead Roma 3-0, Filip Mladenovic grabbing a second, and Zenit lead 1-0 through an Artem Dzyuba effort.

30min: Porto are starting to get on top here as Maxi Pereira cuts inside before seeing his shot across goal deflect off Cesar Azpilicueta and out for a corner.

27min: More bookings for Porto, and again it comes from a reckless tackle as Ivan Marcano is cautioned for a late sliding challenge on Costa. Good to see Diego making friends again...

Marc Andre ter Stegen is at it again. The Barcelona keeper was lobbed from 50 yards in his last Champions League match, now he has conceded from a Hakan Calhanoglu corner which was nodded home from close range by Kyriakos Papadopoulos. Another error from the Barca keeper.

Meanwhile Robert 'Captain Goals' Lewandowski is on the score sheet, netting twice as Bayern Munich now lead Dinamo Zagreb 4-0. Mario Gotze also getting in on the act at the Allianz Arena.

21min: Why always Costa? Chelsea win a free-kick 35 yards out but before it is taken the referee is forced to delay the kick and deal with a confrontation between Costa and a Porto defender inside the box.

No red cards needed today, but more kicking practice needed for Willian whose set-piece only manages to find the sole Porto player standing in a wall.

19min: A first booking of the game and quite right too, as Bruno Martins Indi is cautioned for a terrible challenge on Pedro, sliding in to catch the forward on the ankle.

'Looks like Iker Casillas is saving his best for Mourinho’s return. Not convinced by this new-look Chelsea midfield yet.

'Porto much more aggressive and tenacious in that area of the pitch at present.'

Filip Mladenovic has now given BATE a 2-0 lead over Roma, while Bayern Munich are ahead against Dinamo Zagreb thanks to a Douglas Costa strike.

13min: Great chance for Chelsea! Costa's header plays in Willian who then centres for Pedro to run into the box. The forward attempts a low shot from 20 yards but Iker Casillas dives low to block the effort.

First goal of the evening has come in the other Group G fixture between Maccabi Tel-Aviv and Dynamo Kiev, Derlis Gonzalez plays in Andriy Yarmolenko who then fires the visitors ahead.

BATE also lead Roma 1-0 thanks to a Igor Stasevich strike. 

7min: Top save from Iker Casillas, who is making a record 152nd Champions League appearance tonight.

Diego Costa cuts the ball back for Cesc Fabregas whose near post shot from 20 yards is well palmed away by the former Real Madrid keeper.

It's going to take some getting used to seeing him play for Porto.

'So Willian starts in the Hazard role, Cesc playing behind Diego Costa with Ramires and Mikel holding.'

4min: Back come Porto. Yacine Brahimi tests Asmir Begovic with a 20-yard shot while Vincent Aboubakar's through ball for Andre Andre (so good they named him twice) just evades the forward at full stretch as Begovic collects.

1min: The best and worst of Chelsea inside a minute. The Blues (in black) surge forward in the opening moments, picking out Willian on the edge of the box.

The Brazilian plays a squared pass across the box but it gets nowhgere near a team-mate as Porto break clear. 

Remember to get the most out of our live coverage by following all the action with Sportsmail's excellent Match Zone.

It features the latest line-ups, formations, match stats and a handy player comparison tool.

In addition there are heat zones for EVERY player as well as detailed maps of all the goals as they go in. Click on the above link for more.

Plenty of discussions and theories on Chelsea's team selection. But whether players have been dropped or just simply rested now's the time to find out if Jose Mourinho's bold call is the correct one.

I'm sure we have a rather intriguing 90 minutes coming up...

'Since Mourinho’s return at the start of the 2013-14 season, John Obi Mikel has started only 35 games out of a possible 121 in all competitions for Chelsea.

'Decision to leave Falcao and Remy at home makes a point – but risky to have no centre forward on the bench when starting with a man with such unreliable hamstrings.'

'Hard to see Hazard and Matic dropping to the bench as anything other than a reprimand after Mourinho’s comments yesterday.

'Oscar, Willian and Remy not travelling, as reported on TV, is even more revealing. Clearly not impressing Mourinho at the moment.'

'La Liga has lost its sponsor after the bank BBVA announced it would cease to put its name to Spain’s top division at the end of the season.

'The bank has sponsored the first division in Spain since 2008. Anyway that’s enough about domestic matters, Barça need to get their first Champions League win tonight and they must do so without Messi against Bayer Leverkusen who have former Manchester United forward Javier Hernandez starting up front.'

'Cesc Fabregas seems to be playing in a Rooneyesque head-protector. One stitch in a slight cut suffered in the game at Newcastle.'

So Jose Mourinho has picked a team based on freshness, so for the Blues' sake I hope they are bang at it this evening.

Chelsea are warming up now in Porto where it's just under 20 degrees still. Very pleasant for this time of year. 

Bayern Munich: Neuer, Lahm, Boateng, Alaba, Bernat, Kimmich, Thiago, Gotze, Coman, Lewandowski, Douglas Costa.
Subs: Ulreich, Javi Martinez, Rafinha, Alonso, Gaudino, Muller, Benko.

Dinamo Zagreb: Eduardo, Matel, Benkovic, Taravel, Pivaric, Paulo Machado, Ademi, Soudani, Antolic, Fernandes, Pjaca.
Subs: Jezina, Musa, Henriquez, Goncalo, Hodzic, Coric, Rog.

Referee: Aleksei Kulbakov (Belarus)

'This is our most difficult game in the group phase,' Mourinho told BT Sport. 'They are our real opponents for first place in the group.

'I bring in two fresh players, [Jon Obi] Mikel and Ramires into midfield because Porto played Friday in the league and they had one extra day rest.

'I decided with a fresh midfield because this game will be intense. We are playing much better than the beginning of the season.

'We've had a good 15 days. I hope the first half at Newcastle was out of context. I'm happy with the evolution of the team.'

It's incredible to see Eden Hazard dropped from the Chelsea team, as Ramires comes into the side following his net-buster at Newcastle on Saturday.

Some may think Jose Mourinho has lost his marbles but the Belgian has looked lethargic for a while now, is it just a simple case of resting the midfielder who looks far from the player that fired the Blues to the Premier League title last term.

Barcelona: Ter Stegen, Dani Alves, Pique, Mascherano, Mathieu, Rakitic, Busquets, Iniesta, Sandro, Suarez, Neymar.
Subs: Masip, Douglas, Bartra, Munir, Jordi Alba, Sergi Roberto, Gumbau.

Bayer Leverkusen: Leno, Donati, Tah, Papadopoulos, Wendell, Kramer, Bender, Kampl, Calhanoglu, Bellarabi, Hernandez.
Subs: Kresic, Ramalho Silva, Kiessling, Hilbert, Mehmedi, Boenisch, Brandt.

Referee: Martin Atkinson (England)

Starting XI: Begovic, Ivanovic, Zouma, Cahill, Azpilicueta, Mikel, Fabregas, Ramires, Willian, Pedro, Diego Costa.

Subs: Blackman, Baba Rahman, Terry, Matic, Loftus-Cheek, Hazard, Kenedy.

'Shock omissions from the Chelsea team: No Hazard, no Matic. No Terry either, but that’s becoming less of a shock.'

Casillas, Maxi, Maicon, Marcano, Martins Indi, Danilo, Ruben Neves, Imbula, Brahimi, Aboubakar, Andre.

Just a quick heads up folks. I'll be focusing on Chelsea vs Porto on this page as well as the rest of the Champions League action from across Europe.

I'll keep you posted on any developments with Arsenal too, but to follow more in depth coverage of the Gunners vs Olympiacos, click on the above link where Adam Smith has all the drama at his fingertips...

PETE JENSON: Jose Mourinho even manages to divide opinion at Porto the club where he won back-to-back European titles in 2003 and 2004

The Portuguese side's most radical fans: the 'Super Dragoes', will whistle him tonight as he leads his Chelsea side in their second Champions League group game of the season, despite him being the architect of their greatest success.

Click here for more

Click here for more fixtures, tables and results with our Match Zone service

...can the Champions League follow suit?

Good evening, all. Welcome to Sportsmail's coverage of the Champions League where we Chelsea's visit to Porto, Barcelona, Bayern Munich and the rest of the action.